thumbnail

Seasonal changes in 17-?? estradiol of the Rio Grande Chub (Gila pandora) in south-central New Mexico

Southwestern Naturalist

By:
, , , , and
DOI: 10.1894/0038-4909(2004)049<0311:SCIEOT>2.0.CO;2

Links

Abstract

Timing of gametogensis and thus spawning can be inferred through changes in plasma concentrations of gonadal hormones. In preparation for ovulation and spawning, mean concentrations of 17??-estradiol in a population of Rio Grande chub (Gila pandora) occupying the Rio Bonito, New Mexico, peaked at 37.6 ng/mL on 16 June and declined to 1.50 ng/mL by 11 August. Similarly, the gonadal somatic index (GSI) increased from 9.02 on 21 May (n = 9) to 11.85 on 16 June (n = 2) and declined to 6.10 on 11 August (n = 2). Peak concentrations of 17??-estradiol and elevated GSI in June coincided with peak daylength for the year (14 h and 12 min) and average water temperature of 15.1??C. Concentrations of 17??-estradiol remained low through 3 October indicating no additional spawning events in the Rio Grande chub population. We demonstrated 17??-estradiol is a nondestructive and thus useful tool in estimating timing of spawning in a wild fish population.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Seasonal changes in 17-?? estradiol of the Rio Grande Chub (Gila pandora) in south-central New Mexico
Series title:
Southwestern Naturalist
DOI:
10.1894/0038-4909(2004)049<0311:SCIEOT>2.0.CO;2
Volume
49
Issue:
3
Year Published:
2004
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Southwestern Naturalist
First page:
311
Last page:
315
Number of Pages:
5